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Magnetochemistry
Special Issues
Functional Magnetic Nanomaterials and Nanostructures: Properties and Applications
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Functional Magnetic Nanomaterials and Nanostructures: Properties and Applications

A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Magnetic Materials".

Deadline for manuscript submissions: closed (31 August 2024) | Viewed by 3461

Special Issue Editors

Dr. Yuriy V. Knyazev

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Guest Editor
Kirensky Institute of Physics, FRC KSC SB RAS, 660036 Krasnoyarsk, Siberian Federal University, Krasnoyarsk 660041, Russia
Interests: magnetism; nanomaterials; SPIONs; mössbauer spectroscopy
Dr. Mikhail Platunov

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Guest Editor
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Interests: magnetic materials; interfacial magnetism; interplay between structure and magnetism; local structure; phase transitions; strong correlated electron systems; X-ray absorption fine structure; X-ray dichroism techniques
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The development of modern experimental techniques, especially synchrotron techniques (SAXS, X-ray imaging, XMCD), has allowed scientists to obtain new knowledge concerning the nanostructure and morphology of nano-objects, as well as their physico-chemical properties. The development of our understanding of the origin of properties of nanomaterials is significantly expanding the possible application of such materials. Currently, the use of magnetic nanomaterials has become vital due to, for instance, their high catalytic, sorption activities, and attractive magnetic characteristics. However, the precise investigation of prospective nanomaterials is strictly indispensable, as it may enable the precise tuning of the properties of nanomaterials for precise exploitation methods. This Special Issue welcomes submissions from researchers who study the fundamental origin of the properties of functional nanomaterials and studies exploring their wide area of application.

We hope that this Special Issue of the open access journal Magnetochemistry presents a platform to investigate modern synthesis methods, investigation tools, and new prospective applications of functional nanomaterials.

Dr. Yuriy V. Knyazev
Dr. Mikhail Platunov
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Magnetochemistry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • magnetic materials
  • interfacial magnetism
  • interplay between structure and magnetism
  • local structure
  • phase transitions
  • strong correlated electron systems
  • X-ray absorption fine structure
  • X-ray dichroism technique

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Published Papers (2 papers)

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Research

20 pages, 5977 KiB  
Article
New Branched Iron(III) Complexes in Fluorescent Environment Created by Carbazole Moieties: Synthesis and Structure, Static Magnetic and Resonance Properties
by Denis V. Starichenko, Valerya E. Vorobeva, Matvey S. Gruzdev, Ulyana V. Chervonova, Nataliya G. Bichan, Aleksander V. Korolev and Ivan V. Yatsyk
Magnetochemistry 2024, 10(6), 38; https://doi.org/10.3390/magnetochemistry10060038 - 21 May 2024
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Abstract
The branched complexes of Schiff bases with various iron(III) salts, named G2-[L2Fe]+A− (A− is NO3−, Cl−, PF6−), were synthesized using the condensation reaction between carbazole derivatives of salicylic aldehyde [...] Read more.
The branched complexes of Schiff bases with various iron(III) salts, named G2-[L2Fe]+A− (A− is NO3−, Cl−, PF6−), were synthesized using the condensation reaction between carbazole derivatives of salicylic aldehyde and N’-ethylethylenediamine and characterized by various spectroscopic methods (GPC, IR, 1H NMR, UV/Vis). The studies revealed that the coordination of the two ligand molecules to metal occurs through the nitrogen ions and oxygen atom of azomethine to form a homoleptic system. All the synthesized coordination compounds were examined for their thermal, optical, and magnetic features. Static magnetic measurements showed that only G2-[L2Fe]Cl was in a single-phase HS state, whereas the Fe(III) ions of G2-[L2Fe]NO3 and G2-[L2Fe]PF6 at room temperatures were in mixed low-spin (LS, S = 1/2) and high-spin (HS, S = 5/2) states: 58.9% LS/41.1% HS for G2-[L2Fe]NO3, 56.1% LS and 43.9% HS for G2-[L2Fe]PF6. All G2-[L2Fe]+A− complexes demonstrate antiferromagnetic exchange interactions between neighboring Fe(III) ions. The ground spin state at 2.0 K revealed a Brillouin contribution from non-interacting LS ions and a proportion of the HS Fe(III) ions not participating in AFM interactions: 57%, 18%, and 16% for G2-[L2Fe]Cl, G2-[L2Fe]NO3 and G2-[L2Fe]PF6, respectively. EPR measurements confirmed the presence of magnetically active HS and LS states of Fe(III) ions and made it possible to distinguish two HS types-with strong low-symmetry (I-type) and weak, distorted octahedral environments (II-type). It was shown that G2-[L2Fe]+A− complexes are magnetically inhomogeneous and consist of two magnetic sub-lattices: AFM-correlated chains in layers from the I-type HS Fe(III) centers and dynamic short-range AFM ordered LS/II-type HS Fe(III) centers in the paramagnetic phase located between the layers. Full article
(This article belongs to the Special Issue Functional Magnetic Nanomaterials and Nanostructures: Properties and Applications)
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16 pages, 2922 KiB  
Article
Experimental Investigations on the Ferromagnetic Resonance and Absorbing Properties of a Ferrofluid in the Microwave Range
by Iosif Malaescu, Catalin N. Marin and Paul C. Fannin
Magnetochemistry 2024, 10(2), 7; https://doi.org/10.3390/magnetochemistry10020007 - 26 Jan 2024
Viewed by 1954
Abstract
Measurements of complex magnetic permeability, μ(f,H) = μ′(f,H) − iμ″(f,H) and dielectric permittivity ε(f,H) = ε′(f,H) − iε [...] Read more.
Measurements of complex magnetic permeability, μ(f,H) = μ′(f,H) − iμ″(f,H) and dielectric permittivity ε(f,H) = ε′(f,H) − iε″(f,H), in the frequency range, f of (0.4–7) GHz, and polarizing field, H of (0–135) kA/m, were performed, for a kerosene-based ferrofluid with magnetite nanoparticles. Based on these measurements, the phenomenon of ferromagnetic resonance was highlighted and some microwave propagation parameters of the ferrofluid were determined: the attenuation constant, α(f,H), and the reflection coefficient, R(f,H), at the air-material interface, at the normal incidence. Knowing these parameters we proposed a theoretical model establishing for the first time an equation that allows the calculation of the overall reflection coefficient, Rw(f,H), at the normal incidence of the wave, for a ferrofluid of thickness d, deposited on a totally reflective support, following multiple internal reflections of the electromagnetic wave in the material. The results show that by increasing both, H, and d, the parameter, Rw(f,H) presents a minimum that decreases from 0.90 (for d = 2 mm) to 0.64 (for d = 10 mm), at frequency f = 5 GHz, which indicates an increase in the absorption of the electromagnetic wave by the ferrofluid. The obtained results are useful in the study of some materials that could be used as electromagnetic absorbers in the microwave range, by the determination of the overall reflection coefficient, Rw(f,H), controlled both by the thickness, d, of the absorber and by the external applied field, H. Full article
(This article belongs to the Special Issue Functional Magnetic Nanomaterials and Nanostructures: Properties and Applications)
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